Needle motion for axminster looms



Dec. l0, 1929. A. P. PAINE NEEDLE MOTION FOR AXMINSTER LOOMS Filed July 5, 1928 2 Sheets-Sheet Dec. 10, 1929. A. P. PAINE 1,739,171

NEEDLE MOTION oR AxMINsTER Looms Filed July 5. 192s 2 sheets-sheet 2 i @fix/f P100/)76 9 fwn-@LLM Patented Dec. l1(1), 19291k i UNITED STATES PATENT OFFICE ARTHUR P. PAINE, OF WORCESTER, MASSACHUSETTS, ASSIGNOR T CROMPTON & KNOWLES LOOM WORKS, OF WORCESTER, IMASSACHUSETTS,` A CORPORATION OF MASSACHUSETTS Application led J'uly 5,

Y This invention relates to needle motions for Axminster looms and it is the general object of the invention to provi-de a continuously moving power arm with'such connections. to the needleL as will give the latter dwells of unequal lengths such as are necessary in the ordinary operation of an Axminster loom. 1 1 f In wide Axminster looms the weftlaying needle is usually operated by Ya flexible cable secured to a drum which is caused to oscillate in opposite directions by a segmental gear. The segment is ordinarily operatedby a connector extending from a crank arm which is moved intermittently by a large mutilated bevel gear. The intermittent operation due to the mutilated gear is used to secure the dwells of unequal length which are necessary in the operationof theloom. It is to be understood thatvwhen the needle is in the shed `and cooperating with the selvage shuttle it is necessary that the needle have only a slight dwell of suicient length vto permit the passage of the shuttle, but when the needle is out of the shed and the lay iS moved forwardly to beat in the double pick it is necessaryV that the motion have a longer dwell. .Because of =the intermittent motion heretofore used the l parts ar-e subjected to a'rather harsh V and sudden operation which is found in some instances to interfere with Iincreasing the speed at whieh'the loom is operated.

It is accordingly an important object of my present invention to provide a continuously i moving member which is coupled to the segv ment gear by Ya mechanical device which `f causes the needle to be-given its. proper long and short dwells and thus permit the loom Vto :be run at an increased speed over that which has been found feasible heretofore. VIt isV animportant object of my invention to couple with the usual constantly rotating crank arm a toggle which in one extreme p0- j sition adds its ldwell to that of the crank arm y NEEDLE MOTION Fon AXMINSTEB. Looms 1928. Serial No. 290,330.

practically nothing to the dwell of the crank, so that in one position theneedle is given a short dwell and in the other position it is given a longer dwell. i

Vith these and other objects in view which will appear as the description proceeds, my invention resides in the combination and arrangement of parts hereinafter described vand set forth in the claims. 'i

In the accompanying drawings, wherein a convenient embodiment of my' invention is set forth,

Fig. 1 is a front elevation of a portion of a needle motion made'according to my present invention, showing-the parts in the position they assume when the needle is entirely in the shed, i

F ig. 2 is a diagrammatic view illustrating the relation of the parts when they are in the position shown in Fig. 1 andV it is necessary to produce a slight dwell only in the motion of the needle, an-d Fig. 3 is ,another diagrammatic view but showing the relation of the parts in the position 'they assume when the needle is out of the shed and it is necessary to produce a longer dwell in the motion of the needle.

Referring to Fig. 1, I have shown a loom frame 10 from the right hand end of which extends a needle mot-ion frame 11. 'The latter supports a nedle rail12 which guides and supports the needle carriage 13. The needle 14 is secured to the carriage and has` an eye 15 through which the weft W extends.

On that side 0f the loom opposite the needle motion there is located a selvage forming mechanism including an upright shaft 16 oscillated about its axis by mechanism not shown to cause reciprocating movements of `a head 17. A fixed shuttle race 18 receives a shuttle S, and the parts are so timed that when the needle is .in the position shown in Fig. 1 the shaft 16 will be givenan oscillation to move the shuttle across the vertical plane in which the needle 14 lies. the shuttle being caused by the head to pass through recess 19 in the needle and therefore through the loop formed in the weft W to interweave the selvage warp with the filling. This part of the mechanism is very well understood and its operation is believed to be apparent without further description.

The needle carriage 13 is caused to reciprocate back and forth along the rail 12 by means of a fiexible cable 20 the left hand end of. which is guided by a sheave 2l rotatable about a fixed axis 22 and the right hand end of which is guided by a movable sheave 23 supported on a stud 24. rIhe latter is carried by an arm 25 formed as part of a take-up lever 26 pivoted at 27 to an upstanding horn 28 sup-1 ported by the needle rail i2. The lever 26 may be provided with a segment 29 to cooperate with a holdingpawl 3() pivoted to the frame. A weight 8l acts to move the lever 2G about the axis 27 in a counterclockwise direction, tending always to move the sheave 23 to the right as viewed in Fig. l for the purpose of keeping the cable 2O taut.

The cable is secured to a drum 32 secured to a rock shaft 33 having keyed thereto a driving pinion 34. Said pinion meshes with a segmental gear 85 which swings about a fixed stud 86 as an axis. A shaft 37 is given a constant rotation by means not shown but well understood and operates by mechanism to be described hereinafter to drive a shaft 38 to which is secured a crank arm 39.

The matter thus far described is common construction in wide Axminster looms and with the exception of the character of motion to be imparted to the `crank arm 39 forms no part of my present invention.

In carrying my present improvements into effect I provide for giving the crank arm 39 a continuous rotary movement and for connecting the same to a toggle which operates when in one eXtreme position to add its retarding effect to that of the crank arm, but which acts when in the other extreme position to permit the retarding to be due almost exclusively to that derived from the crank arm. Accordingly, I provide a continuously rotating bevel gear which meshes with the bevel pinion 5l secured to the shaft 38. In this way continuous and preferably uniform rotation is communicated from the driving shaft 37to thc shaft 38 to cause the arm 39 t`o rotate with a continuous and preferably uniform movement.

The toggle to which reference has been made is formed of two links, the segment link 52 being connected to the segment by a stud which is adjustable in slot 54 in a direction toward and from the stud 36 or axis of the segment. The anchored link 55 moves about a fixed pivot 56 which may be supported by the frame 11 and is connected to the segmental link by means of a stud 57. A connector 58 is p-ivotally attached to the arm 89 by means of a stud 59 and is pivoted to the stud 57 as shown in Fig. l.

Referring more particularly to thc diagrammatic Figs. 2 and 3 I have shown how I obtain the dwells of two different degrees from the continuously moving arm 39 and the toggle. In Fig. 2 there is illustrated the means by which the shorter dwell is provided when the needle is in the shed and cooperating with the selvage shuttle. In Fig. 2 the parts are shown in full lines in substantially the position they occupy in Fig. l. As the crank arm 39 rotates in the direction indicated by arrow A it will assume the position shown in dotted lines at I. 'When the arin 3S) is so located as to be in the position suggested by position B the stud 57 will be not quite at its lowest position and the right hand end of the segment will be in the position indicated at the dotted lines C.

As the crank arm continues to rotate' its pivotal connection with the link 58 will pass through the line joining the center of the shaft 3S and the stud 57, in which position the latter will be in its lowest position so that the tion shown in Fig. 2. As the crank arm continucs to move it will assume a position shown at the dotted line D in Fig. 2, causing the segment to move back to the dotted line C. It will be seen, therefore, that a considerable angular movement takes place on the part of the crank arm 39 with a very slight correspending movement on the part of the segment 35.

As the crank arm continues to move in the direct-ion of arrow A it -will act to move the needle out of the shed and it is while the needle is out of the shed and the lay is beating up that it is necessary to provide the longer dwell. As shown in Fig. 3 the crank arm will in the course of its revolutitm around shaft 3S assume the position E, the links 52 and 55 during` that part of the revolution preceding the arrival of the crank arm at the position E having moved to increase tl angle between them and therefore cause the segment to move to the right as viewed in Fig. 3.

lVith the crank arm in the position E in Fig. 3 the point of connection between the toggle links and the connector will be at the position shown at F and as the crank arm continues to rotate it will crossl the line extending from stud 57 and projecting through the center of the shaft 3S, in which position the toggle links will be practically aligned and the toggle therefore straightened out to give its maximum effect to move the segment 35 to the full line position shown in Fig. 3. lVhen the crank arm is in the position indicated at E the right hand end of the segment will assume the position indicated at G in Fig. 3 and by reference to Fig. 2 it will be seen that the space between the final position of the segment tothe left and line C is aractically the same as the distance between line G and the final positionto the right of the segment, but itwill be noted that the angularl dista-nce the crankarmvmoves rom'position E to the full line position in Figi- 3 is considerably greater than is the angular movement of the crank arm Lvfrom position B to the full line position in Fig. 2. This is due tothe fact.v that the natural reta'rding of the ,mov'ement due to the straightening of the toggle joint'is added tothe `retarding of the crank arm and these two reta-relations, being simultaneous, give the necessarily long dwell with the needle out of the shed. As the crank continues to move from the straight line position'to position Hin Fig. v3 the segment 35 will move back t the dotted line G.

. Itis t-o be understood that the parts are vso proportioned that the retardation will not .become appreciable'until the needle is practically out of the shed, so that there need be no delay in the beating up of the lay due to p toogradual a slowing vdown of the motion of the needle.

From the foregoing it will be seen rthat I have provided asimple but rugged needle motion so designed that when the crank arm is in one position a slight dwell is produced in the motion of the needle, the toggle being ineffective to cause a dwell at that time, but

f that when the arm is substantially in the op- `posite by a continuously and preferably constantly of which causes but one dwell in :its cycle ofY moving source ot'V power. It will further be seen that I interpose between the segment andV the shaft 38 two mechanical devicesfone of which by the nature otits motionca'uses two dwells in its cycle of operation and the other operation, and that I so relate these parts that when in 'one extreme position only one device is effective to make its dwell felt in the motion of a needle, but that when in the other eXtreme position both devices act conjointly to produce a dwell of increased length.

' Having thus described my invention it will be seen that changes and modiiications may y be made therein by those skilled in the art without departing from the spirit and scope of the invention and I do notlwish to be limited tothe details herein disclosed, but

Y what I `claim is:

l. In a -needle motion for an Axmi'nster loom, a continuously moving driving member, aweft layingneedle movable into and vout of the shed of the loom, a driven oscillatjing member to be oscillated at different rates ot speed and operatively connected to the Vneedle, two connected mechanical devices,

one for each member, each device Abeing movable to two extreme positions, one of said` devices being effective to cause a retardation on the'part of the oscillating member when the needle is in the shed and also out of the shed, and the other device being eective to cause a retardation in the movement of the oscillating member when the needle is out of the shed.

2. In al needle'motion for an Axminster loom,acontinuously moving driving member, a weft laying needle movable into and outofthe shed of the loom, a driven oscillating member to be oscillated at different rates of speed and operatively connected to the needle, two connected mechanical devices, one

of said devices being operatively connected v and the other device operatively connected to the oscillating member being effective to cause a retarding in the movement of the latter when the needle is out of the shed.r

In a needle motion for an Axminster loom, a continuously'm'oving driving mem` ber, a driven oscillating member to be oscillated at different rates of speed, a needle movable intoV and out ofthe shed of the loom and operatively connected to the, oscillating member, a pair of mechanical devices operatively connected together, one device being connectedto one member and the other device being i connected to the other member, said ,devices simultaneously passing through two eXtreme positions, one of said devices eective to cause a retardation in the movement of lthe oseillating member when the needle is in and also out of -t-he shed and the other device being effective to retard the movement of the oscillating member when the needle is out of the shed.

4. In a needle motion for an Axminster loom, a continuously moving driving member, a driven oscillating member to be oscilf lated at diiferent rates of speed, a needle movable into and out-of the shed of the loom and operatively connected to the oscillating member, two mechanical devices interposed between the members, one of said devices ef- Jfee-tive to produce two retardations for each loom, a continuously moving driving member, a driven oscillating member to be oscillated at different rates of speed, a needle movable into and out of the shed of the loom and operatively connected to the oscillating member, two mechanical devices interposed between the members, one of said devices effeet-ive to produce two retardations for each cycle of movement of the oscillating member, one retardation when the needle is in the shed and the other when the needle is out of the shed, and the other device being effective to produce one retardation only in the cycle of movement of the oscillating member when the needle is out of the shed, -two of the retardations of the devices occurring simultaneously.

6. In a needle motion for an Axminster loom, a continuously moving driving member, a driven oscillating member to be oscillated at different rates of speed, a needle movable into` and out of the shed of the loom and operatively connected to the oscillating member, a pair of mechanical devices interposed between the members, each device receiving a completemovement for each complete oscillation back and forth of the oscillating member, one of said devices effective to produce a retardation at two spaced points in the operationY of the oscillating member, one retardation when the needle is in the shed and the other when the needle is out of the shed, and the other device effective to produce but one retardation in the movement of the oscillating member when the needle is out of the shed.

7. In a needle motion for an Axminster e loom, a continuously moving driving member, a driven oscillating member to be oscillated at different rates of speed, a needle movable into and out of the shed of the loom and operatively connected'to the oscillating member, a pair of mechanical devices interposed between the members, each device receiving a complete movement for each completeoscillation back and forth of the oscillating member, one of said devices effective to produce a retardation at two spaced points in the operation of the oscillating member, one retardation when the needle is in the shed and the other when the needle is out of the shed, andl the other device effective to produce but one retardation in the movement of the oscillating -member when the needle is out of theshed, two of the said points of retardation caused by the devices being sidevices effective to produce a retardation in the movement ofthe oscillating member when the needle is out of the shed and only one of said devices being effective to produce a retardation in the movement of the oscillating member when the needle is in the shed.

9. In a needle motion for an Axminster loom, a continuously moving driving member, a driven oscillating member to be oscillated at different rates of speed, a needle movable into and out of the shed of the loom and operatively connected to the oscillating member, a crank operatively connected to one member, a toggle operatively connected to the other member, means to connect the crank and toggle together to transmit motion from the driven member to the oscillating member, said crank effective to produce two retardations in the motion of the oscillating member for each complete revolution of the crank, one retardation when the needle is in the shed and the other when the needle is out of the shed, and the toggle being effective to produce but one retardation for each complete revolution of the crank when the needle is out of the shed.

l0. In a needle motion for an Axminster loom, a continuously moving driving member, a `driven oscillating member to be oscillated at different rates of speed, a needle movable into and out of the shed of the loom and operatively connected to the oscillating member, a crank operatively connected to one member, a toggle operatively connected to the other member, means to connect the crank and toggle together to transmit motion from the driven member to the oscillating member, said crank eifective to produce two retardations in the motion of the oscillating member for cach complete revolution of the crank, one retardation when the needle is in 'the shed and the other when the needle out of the shed, and the toggle being elfective to produce but one retardation for each complete revolution of the crank, the retard ations of the crank and toggle being added to cause the retardations in the motion of the, oscillating` member to be of unequal durations.

Il. In a needle motion for an Amninster loom, a continuously moving driving member, a driven oscillating` member to be oscillated at different rates of speed, a needle movable into and out of the shed of the -loom and operatively connected to the oscillating member, a crank connected to the driving member, a toggle connected to the oscillating member, means connecting said crank and toggle together, said crank eliective in a com plete revolution thereof to cause two retardations in the movement of the oscillating member, one retardation when the needle is in the Lshed and the other when the needle is out of the shed, and said toggle effective during a complete revolution of the crank to produce but one retardation in the movement of the lUO lll)

oscillating member When the needle is out of the shed.

12. Ina needle motion for an Axminster loom,- a. continuously moving driving member, a driven oscillating member to be oscillated at dilerent rates of speed, a needle movable into and out of the shed of the loom and operatively connected to the' oscillating member, a crank connected to the driving member, a toggle connected to the oscillating member, means connecting said Crank and toggle together, said crank effective in a complete revolution thereof to cause two retardations in the movement of the oscillating member, one retardation When the needle is in the shed and the other when the needle is out of the shed, and said toggle etlective dur# ing acomplete revolution of the crank to produce but one retardation in the movement of the oscillating member, when the needle is out of the shed the retardations due to the toggle being'added to'and simultaneous with one of the retardations caused by the crank.

13. In a needle motion for an Axminsterloom, a continuously rotating crank arm, an oscillatable segment member, a needle movable into and out of the shed of the loom and operatively connected to the oscillating member, an anchored toggle link movable about a ixed axis, a segment toggle link pivotally connected to the segment member, means to connect said links and crank together, said crank When in one extreme position causing the links to be angularly disposed to elfect a slight retardation in the movement of the segmentmember when the needle is in the shed, and said crank When in the other extreme position and when the needle is out of the shed being effective to move `the links into substantial alignment to cause a retardation in the motion of the segment member greater than`-tlie lirst named retardation.

14. In a needle motion for an Axminster loom, a continuously moving crank arm, a needle movable into and out of the shed of the loom, an anchored toggle link movable about a iixed axis; an oscillatable segment operatively connected to the needle, a segment toggle link operatively connected to the segment, a connector pivotally connected to the crank arm, means pivotally connecting the anchored and segment links together with the v connector, said crank When passing through a complete revolution being eective to cause twovretardations in the movement of the segment member at different times in a revolution of the crank arm, one retardation when the needle is in the shed and the other when the needle is out of the shed, said Y crank arm and links beingV so proportioned thatvvhen the crank arm is in one position to eect one retardation in the motion of the segnlfent member said toggle member Will be angiiiflarlyV disposed and ineffective to cause a retarding of the movement of the segment member and said crank When in the other position eective to cause substantial alignment of the toggle links, said substantial alignment causing additional retardation in the movement of the segment member When the needle is out of the shed.

In testimony whereof I have hereunto affixed my signature.

ARTHUR P. PAINE.

sov 

